[Qt-interest] Memory Management in Qt

[Daniel Price]

> -----Original Message-----
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> bounces at trolltech.com] On Behalf Of Oliver.Knoll at comit.ch
> Sent: 26 October 2010 09:34
> To: qt-interest at trolltech.com
> Subject: Re: [Qt-interest] Memory Management in Qt
>

> So normally a user calls "Open file" several times, and each time a QFileDialog would be instantiated - and never deleted, until the application quits.

See Qt::WA_DeleteOnClose.

> I agree, this example is somewhat artificial (normally you would
> instantiate a QFileDialog on the stack, and not on the heap, so problem
> solved :).

I hope not. This is now considered bad practice. You should create the dialog on the heap and connect to the signals it emits. You should not assume that the parent window out-lives the dialog! It is very easy to crash most Qt applications (at least on X11) by killing the main window while a model dialog is shown. Same thing for contextual menus. See

http://labs.qt.nokia.com/2010/02/23/unpredictable-exec/




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